Analysis and Dilute Solution Properties of 12- and 18-Arm-Star Polystyrenes

Jacques Roovers, Nikolaos Hadjichristidis, Lewis J. Fetters

Research output: Contribution to journalArticlepeer-review

177 Scopus citations

Abstract

The homogeneity of samples of 12-arm- and 18-arm-star polystyrenes was investigated by ultracentrifugation sedimentation in a 9 solvent and with gel permeation chromatography combined with low-angle laser light scattering. The former method permits the detection of star polymers with different numbers of arms in a sample, and the latter allows the determination of the number of arms in the stars. Light scattering studies revealed that the star polymer coils are expanded from the random walk size in a 9 solvent for the linear polymer. The strong upward curvature at n < 4 in the reciprocal scattering curve of the stars in a good solvent suggests that the average segment density distribution in the stars is more uniform than predicted by the random walk model. Sedimentation velocity and intrinsic viscosity measurements indicate that these highly branched polymers behave hydrodynamically almost like hard spheres in dilute solution.

Original languageEnglish (US)
Pages (from-to)214-220
Number of pages7
JournalMacromolecules
Volume16
Issue number2
DOIs
StatePublished - Jan 1 1983

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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